大长径比高温热管传热性能实验研究

Experimental Study on Heat Transfer Performance of the High Temperature Heat Pipe With a Large Length-diameter Ratio

在核能主动热利用领域,需要高温热管具有较大的长度并保证均温性,然而现有对高温热管的研究集中在热管性能的理论预测和较短的高温热管预研方面。本文首先制备了67倍长径比高温热管,理论分析了其冷态启动特性,并对其冷态启动和稳态传热性能进行了实验研究,提出了可以发挥其优良传热性能的加热方式;进一步制备了200倍长径比高温热管,定性验证了其良好的传热性能,定量实验研究了其冷态启动过程,并发现了超长高温热管喉部区域的热量传递规律。

In the field of active thermal utilization of nuclear energy,high temperature heat pipes(HTHPs)need to have a large length and ensure superior temperature uniformity.However,the existing research focuses on theoretical prediction of the performance and preparation of the HTHP with a relatively short length.In this paper,the HTHP with the length-diameter ratio of 67 is first prepared,the frozen start-up characteristic is theoretically analyzed,and the frozen start-up and steady heat transfer performance are experimentally studied,and a heating method that could give full play to the excellent heat transfer performance of the HTHP with a large length-diameter ratio is proposed.The HTHP with the length-diameter ratio of 200 is further prepared,and its heat transfer performance is qualitatively verified.The frozen start-up process is investigated by quantitative experiments,and the heat transfer law in the laryngeal region of the super-long HTHP is found.